When cubs are hungry, they produce a grating fingernails-on-blackboard sound, with their lips pulledback from their teeth, to encourage their mother to lie down so they can nurse.
当幼仔饥饿时，它们会将嘴唇向牙齿后拉，发出指甲挠抓黑板般的尖锐叫声，以促使它们的母亲躺下来喂奶。
The branches screeched along the side of the bus like fingernails running down a blackboard.
树枝划着车辆的尖锐声如同指甲划过黑板时的声音。
Look down at your fingernails and see which one is the longest or the sharpest.
观察自己的手指甲，看看哪个最长，或者哪个最尖。
Look down at your fingernails and see which one is the longest or the sharpest.
观察自己的手指甲，看看哪个最长，或者哪个最尖。
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